/**
 * Parse the time to string
 * @param {(Object|string|number)} time
 * @param {string} cFormat
 * @returns {string | null}
 */
export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
      time = parseInt(time)
    }
    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
    const value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
    return value.toString().padStart(2, '0')
  })
  return time_str
}

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
  if (('' + time).length === 10) {
    time = parseInt(time) * 1000
  } else {
    time = +time
  }
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) {
    // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

/**
 * @param {string} type
 * @returns {Date}
 */
export function getTime(type) {
  if (type === 'start') {
    return new Date().getTime() - 3600 * 1000 * 24 * 90
  } else {
    return new Date(new Date().toDateString())
  }
}

/**
 * 防抖
 * @author Farley
 * @date 2020-10-12
 * @param {function} fn   回调函数
 * @param {number} delay  时间
 * @returns {any}
 */
export function debounce(fn, delay) {
  let timer;
  return function () {
    if (timer) clearTimeout(timer);
    timer = setTimeout(() => {
      fn.apply(this, arguments);
    }, delay);
  }
}

/**
 * 获取北京时间/UTC时间
 * isUTC ture为UTC时间 默认fasle北京时间
 * @author Farley
 * @date 2020-10-12
 * @returns {object}  { 日期，时间 }
 */
export function getBJTime(isUTC) {
  const add0 = num => num < 10 ? '0' + num : num;
  let date, y, m, d, h, mm, s;
  date = new Date();
  y = isUTC ? date.getUTCFullYear() : date.getFullYear();
  m = add0(isUTC ? date.getUTCMonth() + 1 : date.getMonth() + 1);
  d = add0(isUTC ? date.getUTCDate() : date.getDate());
  h = add0(isUTC ? date.getUTCHours() : date.getHours());
  mm = add0(isUTC ? date.getUTCMinutes() : date.getMinutes());
  s = add0(isUTC ? date.getUTCSeconds() : date.getSeconds());
  return {
    date: `${y}-${m}-${d}`,
    time: `${h}:${mm}:${s}`
  }
}